Synthesis of sterically congested double helicene by alkyne cycloisomerization.
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DOI: 10.1039/d4cc01573h
Abstract: Alkyne cycloisomerization of 2,7,10,15-tetra(ortho-alkynylphenyl)benzo[g,p]chrysene containing bulky 4-alkoxy-2,6-dimethylphenyl groups at the alkyne terminals selectively proceeded at the sterically crowded bay-region. The obtained double helicene adopts a distorted structure with a high racemization barrier due to the… read more here.
Keywords: sterically congested; congested double; double helicene; alkyne cycloisomerization ... See more keywords
Synthesis of S-shaped polycyclic aromatic hydrocarbons as anthracene-fused double expanded helicenes by intramolecular alkyne cycloisomerization
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DOI: 10.1139/cjc-2025-0093
Abstract: Polycyclic aromatic hydrocarbons [3]DHA and [5]DHA with three and five fused anthracene units, respectively, were synthesized as expanded helicenes with two helical sites. Double intramolecular alkyne cycloisomerization of diaryldiethynylbenzene precursors with PtCl2 catalyst produced the… read more here.
Keywords: intramolecular alkyne; polycyclic aromatic; expanded helicenes; aromatic hydrocarbons ... See more keywords